Improvement in osoillattng-piston engines



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WILLIAM M. ELROD, OF ST. LOUIS, MISSOURI, ASSIGNOR TO HIMSELF AND GEORGEL, WILLIAMS, OF THE SAME PLACE.

Letters Patent No. 67,966, dated August 20, 1867.

IMPROVEMENT IN OSOILLATING-PISTON ENGINES.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, WILLIAM M. ELROD, of St. Louis, in the county of St.Louis, and State of Missouri,

have invented a new and improved Oscillating-Piston Steam Engine; andIdo hereby declare that; the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawings,forming part of this specification.

This invention relates to that class of steam engines known as theoscillating-pist0n engine, and it consists in the peculiar constructionof the piston and the valve and the arrangement of the ports, togetherwith the device for reversing the motion of the engine, as I willproceed to describe.

Figure 1 is a sectional elevation of the engine through the line a: a:of fig. 2.

Figure-2 is a cross-section of fig. 3 through the liney 3;.

Figure 3 is a vertical section of fig. 2 through the line z 2.

Figure 4 is a section of 'fig. 3 through the linez m.

Figure 5 is a view of the oscillating piston.

Similar letters of reference indicate like parts.

In this engine the abutments against which the steam acts are fixed inthe cylinder, and are seen in fig. 3, marked A; B is the cylinder, and Cis the oscillating piston. an (asthe piston standsin fig. 3) are thesteampol' which re two in number. C indicates the exhaust-ports. D isthe oscillating valve. The valve is a hollow cylinder, with aperturesfor the steam-ports'a, and with apertures c for the exhaust of thesteann'as the piston is seen in fig. 3, but when the stroke is made andthe position of the valve is changed for reversingthe motion, 0 becomesthe steam-ports and a the exhaust-ports. As thepiston takes steamthrough the ports a it acts directly against the ahutments A, and as theialve oscillates the ports a are made to exhaust by such oscillation. Asindicated in fig. 2 the steam from the boiler enters through the hollowshaft E, andwis seen in fig.

' 4 it is exhausted from the hollow valve-rod F. G is a chamber upon theside of the cylinder, formed by the cap II, where the reversing deviceis seen. ,h is an arm which is fast on the valve-rod F. J is adisk-plate, which is fast to a slccrc which passes into the cylinder,and which supports the valve-rod. This sleeve is marked d. 0 is anoscillating lever, which is pivoted to the disk-plate J, and which has apin in its end which works in a.

slot in the arm h. ii are pins or studs, which the lover a strikes'asthe valve oscillates, thereby moving the valve and reversing theaction'ot' the engine atiev ery oscillation. kl: are pins in the disk J,which act as stops to govern the vibration of the arm h. L is thecrank-lever, from which the power is taken. m is'a vibrating leverattached to the valve'stcm outside of the cylinder, by which theposition of the valve can vhe altered or changed when desired. Thecentre of the piston is packed in the cylinder by a packing-plate, whichis forced out of its recess by a spiral spring, as seen in figs. 3 at a.i

What- I claim as new, and desire to secure by Letters Patent, is-

The oscillatin piston O, the hollow sllaftE, the oscillating valve D,with its hollowti-alve-stem F, combined and arranged substantially asshown and described for'the'purpose ofiorming an oscillating-pistonsteam engine as set forth.

I claim the lever m, the disk J, the arm h, the lever e, and the pins orstuds ii and k Ir, arranged substantially as described for the purposeof reversing the motion of the piston, as set forth.

I claim the chamber G on the side of the cylinder, substantially asshown and described.

W. M. ELROD.

Witnesses:-

Wn. A.Sc0'r'r, S. lnnrr RAWLE.

